JPS5819046A - Terminal station device for power line carrier telephone - Google Patents

Abstract

PURPOSE:To effectively use a transmission band, by providing a filter means band-limiting each channel at audio band for a plurality of channels respectively and multiplexing the system with a narrow frequency interval for each channel at channel conversion. CONSTITUTION:Channels CH1-CH4 are provided with band pass filters 1-4 filtering a linger signal frequency, high-pass filters 29-32 of communication current of audio band and low-pass filters 5-8. An audio frequency signal band- limited for the channels CH1-CH4 is modulated by using a carrier oscillator 25 and modulators 9-12, and a modulated wave outputted from the modulators 9- 12 is filtered by using band pass filters 13-16. Each filtered output from the filters 13-16 is modulated by using carrier oscillators 33-36 and modulators 17-20 and synthesized with the modulated wave and filtered with a band pass filter 26.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a power line carrier for transmitting voice band communication signals (including at least one voice current cutoff, measurement control signal, data transmission signal, etc.) and ringer signals by a carrier wave suppression single sideband method. The present invention relates to telephone terminal equipment (hereinafter referred to as terminal equipment).

In conventional terminal equipment, each communication path is configured by adding an FS ringer signal after band-limiting the communication current in the voice band via a low-pass P-wave device, and multiplexing each communication path. .

Therefore, the specified transmission bandwidth inevitably limits the communication band and the number of communication paths.In other words, if the transmission (receiving) transmission bandwidth is 5kHz, the communication bandwidth is 0.3 to 2.
There are 2 communication paths for the OKHz communication band, 3 communication paths for the communication band of 10KF (03 to Z3KHz in the case of z width, and 1 communication path for the 0.3 to 1.5KHz communication band without FS ringer signal).
Total of 14 communication paths, 0.3 in case of 18KHz@
Only six communication paths of ~2.3KHz can be secured each.

In addition, if the transmission bandwidth exceeds the specified limit, since the transmission path is a power line, it will have a negative impact on other systems and
There is a drawback that the power line carrier frequency band of ~450 K1-1 z cannot be used effectively.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power line carrier telephone terminal equipment that eliminates the above-mentioned drawbacks and makes effective use of the transmission band.

The terminal station device of the present invention is a terminal station device that transmits a voice band communication current and a limp signal using a single sideband transmission method, and is provided corresponding to a plurality of communication paths, and connects each communication path to the It is provided with a plurality of bandpass f-wave 1 means for band-limiting in the voice band, and is configured to narrow the frequency interval of each call and perform multiplexing at the time of call path conversion.

Next, the present invention will be explained in detail with reference to the drawings.

The multiplexing method for a terminal device with a transmission bandwidth of 10 KHz will be explained.

Since transmission and reception are almost the same process, only transmission will be explained.

FIG. 1 is a block diagram showing a conventional terminal equipment.

The call route is Nayanfuru CJl 1~Channel C1) 40
'Ij' is made up of 4 communication paths.

On the communication path of ci-i1 to CH3, the Ringail frequency 2.55Ki-iz and 2.5Ki-iz are used. ．． 65] (Hz
The waves pass through the wave band, 2 and 3, and the low-frequency P wave devices 5, 6 and 7, which pass 2.3 KI-[z or less F waves of the speech current in the voice band, are installed ( rJ et al., and these radio-1 wave devices are limited to 1.5K11z and below. d1 wave low frequency anecdote f
A frequency converter 8 is provided to perform band limitation.

Next, the band-limited audio frequency signals of CHI to CH4 are transmitted to a carrier oscillator 25 that generates a signal of 128 KIi z, and modulators 9 and 10 provided on each channel.
．． 1lh- and 12, respectively. The modulated wave output from each f/A transformer 9 to 12 is 128.3
F-waves are generated by band-pass P-wave devices 13, 14, 15, and 16, each having a passband of KHz to 130.65 KLIz.

Furthermore, each F-wave output from each of the R-wave generators 13 to 16 is modulated for CHI by a carrier oscillator 21 that generates a signal of 668 KI (Z) and a modulator 17.
, 665.25 KHz for CH2) is modulated by a carrier oscillator 22 and a modulator 18 that generate a signal,
C) (For 3, the signal is modulated by a carrier oscillator 23 generating a signal of 662.5 KHz and one modulator,
For HI4, the carrier oscillator 24 generates a 659.75 KHz signal and the modulator 20 modulates the signal.

Furthermore, the output modulated waves of each are combined and 1.530K
Bandpass r wave generator 2 with a passband of Hz to 540KHz
6, a P wave is generated.

FIG. 2 is a frequency conversion diagram showing the multiplexing process of a conventional terminal station device.

Since it is exactly the same as the explanation for Fig. 1, I will briefly explain it. In the figure, Sl is CI (a voice frequency signal obtained by band-limiting the speech current in the voice band 1, and S2, S3, and S4 are respectively This is a voice agent 5-wave signal in which the communication current in the voice band of CH2, CH3, and CH4 is band-limited.

Band-limited) These audio frequency signals81,82°8
3b and 54Ff, each 128KT (Z's 4.5 rear frequency changes, ""4 and 128.3KHz to 130
．． fi5Kl'1Z (7) Upper sideband wave is P wave 1
, Furthermore, CHl B 668Kr (carrier frequency of z, CH2 665.25T (I (carrier frequency of z, CH3 662.5 KHZ ) 4 Yaria frequency ff
s number, CH4 is modulated with a carrier frequency of 659.75 KHz. 530KHz of this output modulated wave
The lower sideband wave of ~540KHz is r-waved.

Since the carrier frequencies of each communication path are spaced at 2.75 KHz intervals, each communication path is naturally spaced at 2.75 KHz intervals. However, CH4 has a narrow band in order to fit within a transmission band of 1.0 KHz width.

FIG. 3 is a block diagram showing an embodiment of the present invention.The communication paths are composed of four communication paths CI (1 to CH4) as in the conventional case.

The communication paths from CHI to CH4 are equipped with bandpass X6 pass-through F-wave devices 1, 2.3, and 4 that transmit P waves at ringer signal frequencies of 2.55 KHz and 2.65 KHz, respectively, and transmitter 1, 2.3, and 4 for transmitting P waves at ringer signal frequencies of 2.55 KHz and 2.65 KHz, and High-pass P-wave device 29 that passes f-waves above 0.3KHz
, 30 , 31 and 32 and below 2.3 KHz
low-pass P wave generators 5, 6 and 7 are provided,
Bandwidth is limited by these. That is, not only the low frequency band but also the high frequency band of the communication current in the voice band is band-limited for all communication paths.

High-pass wavers 29, 30, 31 and 32 are LCR
If it is constructed using an f-wave device, it will be large and expensive, but if an active r-wave device is used, it can be constructed in an L-shaped configuration at low cost.

Next, the band-limited audio frequency signals of CHI to CH4 are
The signal is modulated by a carrier oscillator 25 that generates a 28 KHz signal and modulators 9, 10, 11 and 12 provided in each communication path. The modulated waves output from each of the modulators 9 to 12 are converted into F waves by bandpass F wave devices 13, 14, 15, and 16, each having a pass band of 128.3 KHz to 130.65 KHz.

Here, the band-pass P-wave devices 13, 14, 15, and 16 block 0.3 KHz or less of the speech current in the voice band, which is equivalent to the Lucara P-wave of 128.3 KHz to 130.65 KHz, and pass the high-pass F Wave devices 29, 30, 31 and 3
It is also thought that it has the same function as 2. However, the purpose is to prevent carrier leakage of 128 KHz and convert the upper sideband into a P wave, and the purpose is different.

That is, the pass band is 128.3 KHz to 130.65 KHz, and the purpose is not to narrow the frequency interval of each communication channel.

Further, each bandpass f-wave device 13, 14, 15 . and 1
668 for each P-wave output from 6 to CHI, respectively.
．． A 25 KHz signal is modulated by a carrier oscillator 33 and a modulator 17, and 1-)6 is applied to Cl-12.
Carrier oscillator 34 that generates a 65.75KHz signal
and modulator 18, and for CH3 it is 663
．． It is modulated by a carrier oscillator 35 that generates a 25KHz signal and a modulator 19, and for CH4 it is 660.7
A carrier oscillator 36 that generates a 5 KHz signal and a modulator 20 perform modulation. Furthermore, these respective output modulated waves are combined and transmitted to a bandpass f-wave generator 26 having a pass band of 530 KHz to 540 KHz.

FIG. 4 is a frequency conversion diagram showing the multiplexing process of this embodiment.

Since it is exactly the same as the explanation of FIG. 3, it will be explained briefly. In the figure, Sl is the band-limited audio frequency signal of CHI, and similarly, 82, 83 and S5 are CH2
, CH3 and CH4 band-limited audio frequency signals. These band-limited audio frequency signals s1, 82 .
83 and S5 are each modulated with a carrier frequency of 128KHz, from 128.3KHz to 130.65KHz
The upper sideband wave is a p-wave. Furthermore, CHI is 668
．． 25KHz carrier frequency, CH2 is 665.75
KHz tl) carrier frequency, CH3 is 663.25
KHz (D carrier frequency, CH4 is 660.75K
Each is modulated with a carrier frequency of Hz.

Of this output modulated wave, a lower sideband wave of 530 KHz to 540 KHz is generated.

Since the carrier frequencies of each communication path are spaced at 2.5 KHz intervals, each communication path is naturally spaced at 2.5 KHz intervals.

Even if the frequency interval is narrowed in this way, band 9 - Since it is limited, it is possible to eliminate adverse effects on adjacent communication paths.

Note that the iM column connections between the high-pass Pe devices 29 to 32 and the low-pass flooders 5 to 8 in this embodiment may be configured by K only for the band-pass flooders having the functions of both.

As is clear from the above explanation, in this embodiment, Kjs has a bandwidth of 0.3 to 2.3 within the 10 Kl-Iz bandwidth.
Kllz, 7) communication band and 1"S') communication channel can be configured into 4 communication paths.

As a result, CLr4 can be equipped with an F8 ringer and can be used as a telephone communication path. Furthermore, even if it is used as a data transmission line with a wide band, a large amount of data can be transmitted.

Furthermore, by keeping the transmission (or reception) transmission width to 10 KHz, it is possible to install the system without adversely affecting other existing lines.

In this embodiment, the sending (or receiving) transmission bandwidth is 10K.
Although we have described the case of Hz width, even if the transmission (or reception) transmission bandwidth is 5KHz width, it is also 0.3
If the present invention is applied to the conventional two-path configuration with a communication band of ~2.0 KI-1z and FS ringer numbers of 2.3 KHz and 10-24 KHz, the communication band will be 0.3 to 2.0 KHz. ．． 3Rr
Iz call band and 2.55KHz and 2.65KHz
It is possible to configure two communication channels with the FSU and NNG signals. l, in 18KHz width, 0.3-2.3KH
For a conventional 6-path configuration with a communication band of 255 KHz and FS ringer signal of 2.65 KHz and 2.65) G (z), applying the Jf of this invention increases the communication band of 0,:3-13 KHz cr) and 2.65 KHz and 2.65 KHz. 55K)iz and 2.65KHz 11”
4 channels with S ringer signal and 0.3 to 3.
4KHz communication band and 3.80KH1, 3,88KH
A total of 6 communication paths can be configured, including 2 communication paths with z, FS, and S ringer signals.

As described above, the present invention has the effect that the transmission band can be used effectively by reducing the frequency interval between each communication path.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional power line carrier telephone terminal equipment, Fig. 2 is a frequency conversion diagram showing the multiplexing process of the conventional power line carrier telephone terminal equipment t, and Fig. 3 is an embodiment of the present invention. and FIG. 4 are frequency conversion diagrams showing the multiplexing process of this embodiment. 7. 8...Low pass F wave device, 9,10°11.12...Modulator, 13.1
4,15.16---band MaJP wave 6.17,18,
19, 20...Modulator, 21, 22, 23, 2
4...Carrier oscillator, 25...-Carrier oscillator, 26...Band pass F wave generator, 29,
30, 31. 32...- High-pass f-wave device, 33,
34, 35. 36...Carrier oscillator, Sl.
...CF (1 audio frequency signal, 82...
Audio frequency signal of CH2, S3...Audio frequency signal of CH3, 84...Audio frequency signal of CH4.

Claims (2)

[Claims] (1) In a power line carrier telephone terminal equipment that transmits speech current and ringer signals in the voice band by a single sideband transmission method, each channel is provided corresponding to a plurality of communication paths, and each communication path is connected to the voice band. A power line carrier telephone terminal station comprising: a plurality of band-pass R-wave means for band-limiting, and is configured to perform multiplexing by narrowing the frequency interval of each communication path during communication path conversion. Device. (2) Each of the band-pass f-wave means is constituted by a series circuit consisting of a band-pass P-wave device or a high-pass r-wave device and a low-pass ripple device. 1
) The power line carrier telephone terminal equipment described in item 2.